How to Select Unique Values of Data Frame Column in R (Example Code)
In this R tutorial you’ll learn how to select only unique values from a vector or data frame column.
Creating Example Data
data(iris) # Loading example data head(iris) # Sepal.Length Sepal.Width Petal.Length Petal.Width Species # 1 5.1 3.5 1.4 0.2 setosa # 2 4.9 3.0 1.4 0.2 setosa # 3 4.7 3.2 1.3 0.2 setosa # 4 4.6 3.1 1.5 0.2 setosa # 5 5.0 3.6 1.4 0.2 setosa # 6 5.4 3.9 1.7 0.4 setosa |
data(iris) # Loading example data head(iris) # Sepal.Length Sepal.Width Petal.Length Petal.Width Species # 1 5.1 3.5 1.4 0.2 setosa # 2 4.9 3.0 1.4 0.2 setosa # 3 4.7 3.2 1.3 0.2 setosa # 4 4.6 3.1 1.5 0.2 setosa # 5 5.0 3.6 1.4 0.2 setosa # 6 5.4 3.9 1.7 0.4 setosa
Example: Applying unique() Function to Extract Unique Values of Column
unique(iris$Species) # Select unique values # [1] setosa versicolor virginica # Levels: setosa versicolor virginica |
unique(iris$Species) # Select unique values # [1] setosa versicolor virginica # Levels: setosa versicolor virginica
Related Articles & Further Resources
You may find some related R programming language tutorials on topics such as character strings, numeric values, vectors, and extracting data below: